Lenze E82xVxxxKxxxxx - Manual (Page 271)

Function library
Optimising the operating behaviour
Inverter switching frequency
10
l
271 EDS82EV903 EN 3.0
IMPORTANT Possible settings Code
Selection Lenze Name No.
C0144
v
Temperature−
dependent
reduction of
the switching
frequency 1 0 No temperature−dependent reduction
of the switching frequency During operation at a switching
frequency of 16 kHz the frequency
is also reduced to 4 kHz. This
behaviour can be changed in
C0310.
^ 270
1 Automatic reduction of the switching
frequency to 4 kHz if
J reaches max. − 5
°C
Automatic switching frequency reduction
C0144 = 0 (no temperature−dependent switching frequency reduction)
If the maximum heatsink temperature (
J
max
is exceeded when using a switching
frequency of 8 kHz or 16 kHz) the inverter will be inhibited, TRIP "OH" (overtemperature)
will be set and the motor will coast to standstill.
C0144 = 1 (temperature−dependent switching frequency reduction is active):
ƒ If the heatsink temperature
J
max
− 5 °C is reached when using a switching frequency
of 8 kHz or 16 kHz the controller automatically reduces the switching frequency to
4 kHz thus keeping the operation running.
ƒ After cooling the heatsink the controller automatically changes to the switching
frequency set.
)
Note!
The switching frequency is automatically set to its optimum value depending
on the apparent motor current and output frequency to ensure trouble−free
operation.
ƒ The noise emission changes.
ƒ The user cannot influence this function.
Tip
Medium−frequency motors are only allowed to be operated on 8 kHz sin or 16 kHz sin.